<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let i = prompt("请输入")
        switch(i){
            case "1":
            alert("星期一")
            break
            case "2":
            alert("星期二")
            break
            case "3":
            alert("星期三")
            break
            case "4":
            alert("星期四")
            break
            case "5":
            alert("星期五")
            break
            case "6":
            alert("星期六")
            break
            case "7":
            alert("星期日")
            break
        }
    </script>
</body>
</html>